<template>
    <div class="app-container">
        讲师添加
         <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name"/>
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" controls-position="right" min="0"/>
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career"/>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea"/>
      </el-form-item>

      <!-- 讲师头像：TODO -->
      <!-- 讲师头像 -->
      <el-form-item label="讲师头像">

          <!-- 头衔缩略图 -->
          <pan-thumb :image="teacher.avatar"/>
          <!-- 文件上传按钮 -->
          <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像
          </el-button>

      <!--
        v-show：是否显示上传组件
        :key：类似于id，如果一个页面多个图片上传控件，可以做区分
        :url：后台上传的url地址
        @close：关闭上传组件
        @crop-upload-success：上传成功后的回调 
          <input type="file" name="file"/>
      -->
          <image-cropper
              v-show="imagecropperShow"
              :width="300"
              :height="300"
              :key="imagecropperKey"
              :url="BASE_API+'/eduoss/fileoss'"
              field="file"
              @close="close"
              @crop-upload-success="cropSuccess"/>
      </el-form-item>

      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
      </el-form-item>
    </el-form>

    </div>
</template>

<script>
import teacherApi from '@/api/edu/teacher'
import ImageCropper from '@/components/ImageCropper'
import PanThumb from '@/components/PanThumb'

export default {
  components: { ImageCropper, PanThumb },
  data() {
    return {
      teacher:{
        name: '',
        sort: 0,
        level: 1,
        career: '',
        intro: '',
        avatar: ''
      },

      //上传弹窗组件是否显示
      imagecropperShow:false,
      //上传组件key值
      imagecropperKey:0,
      //获取dev.env.js里面地址
      BASE_API:process.env.BASE_API,
      saveBtnDisabled:false  // 保存按钮是否禁用,
    }
  },
  created() { //页面渲染之前进行
    this.init()
  },

  //监听
  watch:{
    $route(to,from){ //路由变化方式，路由发生变化，方法就会执行
      this.init()
    }
  },

  methods:{
    //关闭上传弹窗的方法
    close(){
      this.imagecropperShow = false
      //上传组件初始化
      this.imagecropperKey = this.imagecropperKey+1
    },

    //上传成功的方法
    cropSuccess(data){
      this.imagecropperShow = false
      //上传之后接口返回图片地址
      this.teacher.avatar = data.url
            //上传组件初始化
      this.imagecropperKey = this.imagecropperKey+1
    },

    init(){
      //判断路径是否有id值
      if(this.$route.params && this.$route.params.id){
        //从路径获取id值
        const id = this.$route.params.id
        //调用根据id查询的方法
        this.getInfo(id)
      }else{ //路径没有id值，做添加
        //清空表单
        this.teacher = {}
      }
    },

    saveOrUpdate(){
      //判断修改还是添加，根据teacher是否有id，修改时带id；添加时不带id，因为系统默认给id值
      if(!this.teacher.id){
        //添加讲师
        this.saveTeacher()
      }else{
        //修改讲师
        this.updateTeacher(this.teacher) //修改讲师加了teacher形参，添加讲师没加形参，两者效果最后一样，只是做个比较
      }
    },

      //添加讲师的方法
    saveTeacher(){
      teacherApi.addTeacher(this.teacher)
      .then(response =>{
            //添加成功
            this.$message({
            //提示信息
            type: 'success',
            message: '添加成功!'
          });
          //回到列表页面 路由跳转
          this.$router.push({path:'/teacher/table'})
      })
    },

    //根据讲师id查询的方法
    getInfo(id){
      teacherApi.getTeacherInfo(id)
      .then(response =>{
        this.teacher = response.data.teacher
      })
    },

    //修改讲师
    updateTeacher(teacher){
      teacherApi.updateTeacherInfo(this.teacher)
      .then(response =>{
            //修改成功
            this.$message({
            //提示信息
            type: 'success',
            message: '修改成功!'
          });
          //回到列表页面 路由跳转
          this.$router.push({path:'/teacher/table'})
      })
    }
    }
}
</script>
